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A–C, Cytoarchitectonic parcellations of the human lateral frontal cortex based on Brodmann (1909) (A), Sarkissov et al. (1955) (B), and Petrides and Pandya (1994) (C). Note the variability in the shape and extent of the same region in each parcellation scheme (e.g., region 46 in A and B). Note also the differences in the number of divisions (e.g., region 9 appears homogeneous in B, whereas it is further subdivided in C).
